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COMSAT(8)               FreeBSD System Manager's Manual              COMSAT(8)

NAME
     comsat - biff server

SYNOPSIS
     comsat

DESCRIPTION
     Comsat is the server process which receives reports of incoming mail and
     notifies users if they have requested this service.  Comsat receives
     messages on a datagram port associated with the ``biff'' service
     specification (see services(5) and inetd(8)).  The one line messages are
     of the form:

           user@mailbox-offset[:mailbox-name]

     If the user specified is logged in to the system and the associated
     terminal has the owner execute bit turned on (by a ``biff y''), the
     offset is used as a seek offset into the appropriate mailbox file and the
     first 7 lines or 560 characters of the message are printed on the user's
     terminal.  Lines which appear to be part of the message header other than
     the ``From'', ``To'', ``Date'', or ``Subject'' lines are not included in
     the displayed message.

     If the user specified is logged in to the system and the associated
     terminal has the group execute bit turned on (by a ``biff b''), two bell
     characters (ASCII \007) are printed on the user's terminal.

     If mailbox-name omitted, standard mailbox assumed.

FILES
     /var/run/utmp   to find out who's logged on and on what terminals
     /var/mail/user  standard mailbox

SEE ALSO
     biff(1), inetd(8)

BUGS
     The message header filtering is prone to error.  The density of the
     information presented is near the theoretical minimum.

     Users should be notified of mail which arrives on other machines than the
     one to which they are currently logged in.

     The notification should appear in a separate window so it does not mess
     up the screen.

HISTORY
     The comsat command appeared in 4.2BSD.

FreeBSD 11.0-PRERELEASE         August 9, 2002         FreeBSD 11.0-PRERELEASE

NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | BUGS | HISTORY

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